An Optical Reflector System for the CANGAROO-II Telescope

Details An Optical Reflector System for the CANGAROO-II Telescope An Optical Reflector System for the CANGAROO-II Telescope

1999-11-30

arxiv.org/abs/astro-ph/9911509v1

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, to appear in the proceedings of the GeV-TeV Gamma-Ray Astrophysics Workshop, "Towards a Major Atmospheric

Scientific paper

We have developed light and durable mirrors made of CFRP (Carbon Fiber Reinforced Plastics) laminates for the reflector of the new CANGAROO-II 7 m telescope. The reflector has a parabolic shape (F/1.1) with a 30 m^2 effective area which consists of 60 small spherical mirrors. The attitude of each mirror can be remotely adjusted by stepping motors. After the first adjustment work, the re ector offers a point image of about 0.14 degree (FWHM) on the optic axis. The telescope has been in operation since May 1999 with an energy threshold of ~ 300 GeV.

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